// mixins
@define-mixin btn
$width: 100%,
$padding-tb: 15px,
$color: #333,
$background-color: #fff,
$font-size: 14px,
$border-radius: 4px,
$border: 1px solid #ddd,
{
  width: $width;
  padding: $padding-tb 10px;
  color: $color;
  background-color: $background-color;
  font-size: $font-size;
  border-radius: $border-radius;
  border: $border;
  cursor: pointer;
  outline: none;
  text-align: center;
}